Electron Emission from <TEX>$Pb(Zr_xTi_{1-x})O_3$</TEX> Ferroelectrics by Pulsed Electric Field

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J. Korean Ceram. Soc. > Volume 37(1); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(1): 6.

펄스 전기장에 의한 $Pb(Zr_xTi_{1-x})O_3$ 강유전체의 전자 방출

김용태, 윤기현, 김태희¹, 박경봉¹, 곽상희¹

연세대학교 세라믹공학과
¹안동대학교 재료공학부

Electron Emission from $Pb(Zr_xTi_{1-x})O_3$ Ferroelectrics by Pulsed Electric Field

ABSTRACT

Electron emission from the Pb(ZrxTi1-x)O3 ferroelectrics by pulsed electric field has been investigated as a function of Zr/Ti ratios such as 35/65, 50/50 and 65/35 below 250kV/cm. Electrons were emitted regardless of the applied field polarity to the rear electrode. When the negative field was applied to the rear electrode, the electron emission charge was more stable. It was proved that the electrons were emitted at the edge of the upper electrode. The emission charge increased in order of 65/35>50/50>35/65. The electron emission characteristics were dependent on the ferroelectric properties such as polarization and coercive field. The emission charge and emission threshold field were affected by the polarization change and the coercive field, respectively. This result explains that the electron emission is a field emission with polarization induced surface potential by a modified Fowler-Nordheim plot of emission charge.

Key words: Ferroelectric, Electron emission, PZT, Cathode, Electron gun